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Re: furnace won't turn on when temp drops below setting.
I just had a problem with my heater that had the same problem. It was the board that had to be replaced. I took the panel off outside and used a hair dryer to heat up lightly the circuit board. Immediately, the heater came on. If this doesn't work, you may have a bad T'stat. Is yours a mercury one? A digital T'stat may be the answer
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Make sure your air filter is clean. Is the thermostat satisfied? or is the room temp. still below the thermostat setting? When ever you have to turn the power off and then back on to a furnace that usually indicates that the furnaces ignition control locked out. The first thing that I would try is cleaning the flame rod.
This is normal to a point. A thermostat turns the furnace on and off as you know. However there is a separate thermostat, usually on the side of the plenum that runs the blower fan. It will keep the fan running until the air temp in the plenum drops below a certain temp and then turns the fan off. If it's not shutting off at all then that thermostat is likely bad and will need to be replaced. Hope this helps.
Well, here is the deal: unless you rewired from two wire to multiple (usually 4 to 10 wires) wires, the fan cannot be controlled from the thermostat, even though the thermostat indicates that it can > it is a physical wiring and fan administration issue.
Unless you have a newer furnace, the fan is controlled by plenum temp. Works like this: burner turns on, no fan until the plenum temp reaches set temp,....then burner off, and fan keeps running until pelnum temp drops, and often the fan may kick on a few more times as this temp depletes.
The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier. Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/
However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.
by restart button you mean reset i believe,its located on top of oil burner and says only push one time .if thats the button your pushing it is the reset button or retry for oil burner if you are pushing this there is a problem with burner
if your furnace is on 24 hours straight, before it heats up your home, then either your cold weather and indoor temps are extreme, or your unit is grossly undersized. if however your furnace cycles on and off when the temp is still way colder than you have set it you have either a bad stat that thinks its hotter than it is, or a bad furnace problem and even though the furnace is getting a signal from the stat to heat it is failing to do so. you'll have to watch and think this through to isolate the problem. if you set the furnace to max heat and it runs and heats the house reasonably quick then its probably going to be a bad stat. if you set it to max heat and it shuts off way before it gets to setpoint then the problem is in the furnace. be sure filters are clean, blower wheel is clean , returns are no obstructed, etc. if you by chance have an old mercury bulb stat they had a thing in them called a heat anticipator which basically worked like this. a dial with a little pointer determined how soon it would be till the furnaced reached the desired temp and anticipated how soon to shut off the burners in anticipation of the cool down period so you dont overshoot the desired temp. if these are bad or moved to different setting they can short cycle the furnace on of on off etc. or shut down the burner almost as soon as it lights. setting is usually at .4 to .6 on most, but really a digital stat is only way to go. by the way check to be sure you don't have a hot air supply grill blowing directly on the stat or it will shut off as soon as stat gets hot and rest of house will be cold. usual location is 5 feet off floor directly over the main return air grill or under it as the case may be. good luck
Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.